Zebedee - having had a quick look at this ,I'm wondering why no measurements were quoted to substantiate the planning officer's conclusion that the development would not result in a loss of less than 50% of what they call amenity space which they equate with the rear garden . And ,not that it would help your case but I thought it was 50% of land around the orginal house ? I share your concern about the lack of knowledge /professionalism at these meetings .